diff --git a/include/mbedtls/cipher.h b/include/mbedtls/cipher.h
index e7e222c..c2745e8 100644
--- a/include/mbedtls/cipher.h
+++ b/include/mbedtls/cipher.h
@@ -321,6 +321,18 @@
     /** CMAC-specific context. */
     mbedtls_cmac_context_t *cmac_ctx;
 #endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    /** Indicates whether the cipher operations should be performed
+     *  by Mbed TLS' own crypto library or an external implementation
+     *  of the PSA Crypto API.
+     *  This is unset if the cipher context is setup through
+     *  mbedtls_cipher_setup(), and set if it is setup through
+     *  mbedtls_cipher_setup_psa().
+     */
+    unsigned char psa_enabled;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
 } mbedtls_cipher_context_t;
 
 /**